Requirements on validation: (1) combine schemas, (2) divide a document into pieces and validate each piece, (3) use different schema languages, (4) validators work together

From: "Costello, Roger L." <costello@mitre.org>

To: <xml-dev@lists.xml.org>

Date: Sun, 27 Apr 2008 16:33:31 -0400

Hi Folks,
Here are a few snippets from slides by MURATA Makoto:
Requirements on validation#1
- It should be possible to combine schemas representing vocabularies
easily.
- It should be possible to divide non-monolithic documents into pieces
and then validate each piece against one of the schemas.
(divide-and-validate)
Do existing schema languages meet these requirements?
- No, you have to understand all schemas very well and change them.
- No, you have to validate the entire document against the combination
of all schemas.
- W3C XML Schema
- RELAX NG
Requirements on validation#2
- It should be possible to use different schema languages for different
vocabularies.
- Validators for many schema languages should work together.
Do existing schema languages meet these requirements?
- No, you are forced to use one schema language.
- No, you have to use one validator.
- W3C XML Schema
- RELAX NG
More... www.asahi-net.or.jp/~eb2m-mrt/svgopen/200409SVGOpen.ppt
/Roger